Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:1.10.3.3 (ascorbate oxidase)
 778 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The ability of vitamins C, E and K to inhibit enzymes directly has been investigated. It was found that vitamin E and some analogs and menadione (vitamin K3) inhibited several enzymes irreversibility at concentrations below one millimolar. Ascorbate inhibits rabbit muscle 6-phosphofructokinase (MPFK-1; EC 2.7.1.11), muscle type LDH (EC 1.1.1.27), and muscle AK (EC 2.7.4.3) at low concentrations that do not inhibit equivalent liver isozymes. Ascorbate Ki values for muscle-type LDH and heart-type LDH isozymes are 0.007 and 3 mM, respectively. The ascorbate Ki value for rabbit skeletal muscle PFK-1 is 0.16 mM; liver PFK-I is not inhibited by ascorbate. Dehydroascorbate does not inhibit any enzyme at ascorbate concentrations normally found in cells. All ascorbate inhibitions are completely reactivated or nearly so by L-ascorbate oxidase, CYS, GSH, or DTT. We propose a hypothesis that ascorbate facilitates glycogen storage in muscle by inhibiting glycolysis. The relationship between ascorbate metabolism and diabetes is discussed.
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PMID:Inhibition of rabbit muscle isozymes by vitamin C. 1081 Oct 33